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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4f91b87c6128e56d7507aa0d81779cb826ded6f4811e719b4504563944ffb06' 
  AND token = 'x7B594R/9Gw8ymAjwH8HqvQ76NvTHwyaoqkIMdUVEUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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