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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fcd75e60d3042aea60498c6a207d8186c4333d80e7016777c0c7da2c22094cd' 
  AND token = '6GMUzp7fO4uToLwUpj4uwJ7iytC7gyhJSe53CeoDAnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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