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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c39cba2d6c1a82ee018209c920b4386ad904bc7c1c17e61291a3cba276e1906' 
  AND token = 'UrwxVDOhWNHB4R/6lcECbb0PjHRj9CN3CpJpoXZ5ofU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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