SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5105face6a252e5f8d39dec319d263412d67ba37b6462714ad606ec7f5ce24c5' 
  AND token = 'Q1LjOPpjj7YvXGLjMIwu1xvKB+CqVZNCPcC/lq13CsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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