SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a51d97179f92f39ff1da313ba6f883901b12cf45982659bd6f1fa8c71222605' 
  AND token = 'pGEr8KC7u3V+waTrOvHTTA//QaRSZ4aA7azq4bePF50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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