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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c993d7bb2bfb1c508314c97b65909e8bd48ef62bcf067b502275111b4b4e0fa1' 
  AND token = 'OVtdAAW20m1ROCI5TdElM4dAGUvX7P9Tz7QQyMb5vtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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