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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1aa36523ca3a13e0be2c00348e0bbd798bbacda8570744ab1852848f0dcc7be' 
  AND token = 'Q8WSPglV56yT6yMhILLygS2YZGgM0EEfRrUhgeopxqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}