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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8eda5f519379da2de357713e2c0d42e2d987f268660a41744352802a324cf755' 
  AND token = 'U7B51txGZ+7+30WBLG8X0eUUfKBuQoZq5nr5q3fTvqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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