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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3aa38c833c7e299cce572eac786e97eab8bff8c71ab183e892190874cf8971a9' 
  AND token = 'nEzufqjJ4AV4vPF0YWSEsCIEya9OPD7D/Qy7hf40Az4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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