SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7da328dce6ca05b336acfcb91732d6920216f144480f5ceac6254c39672dc98' 
  AND token = 'KL3pQD1rRILsA4kuH27b2+fvnZuYZSIrJ9hMz9N5XZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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