SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a110f85fd2667605cac34b934276321c6996eeb290975533ab904e4ef952062' 
  AND token = 'RGrfwOvk+seutUnFqELxtNfvZ/R8VJDqanbQTR6D0kA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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