SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5a925d8765f5f54ba3d5a24ddc50675b2bbc19488a8dcf31fe9e5846f88302c' 
  AND token = 'zqR+HFbKjvsUjtwk91umGA+QMIgHxYowzk+r2UFF7GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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