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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54600f43dddd67d9a99ea3bada45d3744f195745fa33cd01121cf4b8e6c08479' 
  AND token = 'TPq3YWUYE4bY2qk3NzNV8pLjdO4oTZChZx9NCqdU0aI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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