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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77f47b673a9caad4b5cd35d90fcc411195205c8dc92c317aa4c84731d1c1ccdd' 
  AND token = 'xFAQFym1eOxrYwom66jHl8xkXDBk8Ry/f0W2qMrtLag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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