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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a5e75f48fa5b146a6e1fcf9e79e1848e94b627b73a9b0c8ba96bdcced5f155d' 
  AND token = 'CA7W6vAKUHdIRyuTj8Srs/VCJ8JveF2Ouk7oARg4GmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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