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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '428a6666f03f780c5f3f60065bdb687832ca0d2f9f385ffb392b92006b0d7240' 
  AND token = 'Dgj7yzASm5QoXbfTODIRg4ed91Zu/yoUddexYvSeRj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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