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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d735a0cca02f79470f71bbe9622deca65a9751084db68eee058efe99a0e0eb8' 
  AND token = '6LLlZfu98zjHgr1F++DBfoEtKl1zk+jkD8tU9B8gcIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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