SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4a74425453e0a11d135edeaca395010d61d0b53a4e936ecc4893271829c459e' 
  AND token = 'RZuEnRKsJfobrf8qIJB3GKbyr4Y9wZoM+nMfBVvg9Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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