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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd430d7afa8803fd43368c4ba8b760646d7f9547242cf2c44840a83cc4f832e8a' 
  AND token = 'Vbma/C15zVBUH36YogV5saeDA56d4PMvGNsQMYmJRj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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