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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29e15da7fe7d245467636c209ee0244961d8870662853622c313e74f51f1a2ca' 
  AND token = 'kkn8LnA/5a3NolcTVe06LmZOiLMnU1ox/Q85rfb8FmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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