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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '875ec566daa1134d7229257ffc498766e057e559c3652ff0926430a99a6c072d' 
  AND token = 'Djki631Mq484aagXccI5Vxq7s4RhDUVM3qsxnGi1BMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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