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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6a08693f5be229321b0cad52b5a11e308b981942a331c95e1913ef9993c7584' 
  AND token = 'kegEtk/U8UlYsbtTTmI0djwPwQFY9Fvnf4LClRk97n4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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