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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c37a046822f73d77ef3d5a1d737ce76fa8d68fc20ad22ce909dde757aad4585d' 
  AND token = 'bJAtRKRKTovRoPz78Zl50F2sm352nOSP1TzlI9BVuo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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