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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57a8717ce324ae5e8c43bc1eeec67e0fa7c8c20b0d7c7a308dd2f5f87124b6ae' 
  AND token = 'wEAieFijf8xEsxdNSK2RFKguN3Fds3/CmSVaEmXJYwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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