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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fabb23753e170b6b9c520e2f57133372120503a7955bb0106064710033232d1f' 
  AND token = 'dIzwQMU7w4clvvWuoLdaVHmjpP834Ae5cZc/6J88mTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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