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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b6d89eed8550e569c3aa1ce563c9842b45369dcca36bdfb29db41527ddb74af' 
  AND token = '4YEIiqB3M2oun9f7HcauDvSU5vv9oBNdk9M3OUv39Ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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