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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b15cb3e27e285ae6c18f9a8efa9a7994a17d016e776c59d43b12cbe5abd39a97' 
  AND token = 'lYo3LGMKJIIWJ7EAdEjFlPoNEpLTBB9jGcdHAE18FQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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