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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1df1bdbcc3a3545be09ddb1efd0a028927a1d6569ebe4994aa46e4437c217c01' 
  AND token = 'TwPsaQ402Jkpoa8AEPnEZZoERPoi6Qv6TUkBuQAkR9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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