SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43db69f050aefe06673dae5660e587990486d01c91ff1b46b17fe5ba012a9491' 
  AND token = 'CbChhCXJpFEjJPih32qRrXJ8gbEsQsyiYhwGM2+NKLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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