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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a5ee51e0e087e14e320586f89209bf53404bf61c844bb37ac13a801c189a6827' 
  AND token = 'PPu9GAfMOuR9e17ZxEiO5S3oWFL8mMq4iJaSu35Gagc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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