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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '200d8ca19ac2d9eb51f4ca10af193d9b667be3319133828fe4c74d6d8e1b7a87' 
  AND token = '/4gA9c9PmUwk+s5MIm6UQea4tm+q61LQh3yTd/vJcaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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