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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '835ed0c799ce89042eab33d4a424f83e598af76f466c03582919f4c82d24db12' 
  AND token = 'Yor/aqeRuh1tOAjd1FlXrC9GAO8NMQ5wJiln8oMT4bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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