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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '798857421d906b8d1b557fe484122e2f1afc9dc370a70cd2d7ce910808e36946' 
  AND token = 'G/i1cKVfaR9u1noDTINXtPL00OYORYx+p61ADF+ojio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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