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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2df5033533c9ef8f52a6721199904ae40a75b60ade14ca70c360f64c99b73085' 
  AND token = '0IXTQAGyX3OGc8rAn7rLGb2a7sK/2FMQhTFvQhC39/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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