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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b59a130af56110809b1f158826a8e1615c96b69a4b4a3ad7e3efaa32cb26a03' 
  AND token = 'PgtHoKNqaQQzXOr9BQ7PlQ9mpgosyk2EDnYGXj74FmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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