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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '72ef6c34fc09dd144cfaf540f56e5eb1e88b33877f510ff776d80705bd16dd74' 
  AND token = 'K4MQbRZBYYYGbWlD+fbjxoIFNMv8AC43k3ef+XR/N2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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