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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a69956ca6009dc7434ce8148da9345c22e62aaecb5acfea277049e4275ba5fc' 
  AND token = 'gvZD2DOS+Y6zYYQjwqbp6ikP5LY9x031pSwHkmxRHPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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