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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84aa0992b06d5818c9a4de2241e2e3883b924fd243907dcc8c1df8b5d9fb22ac' 
  AND token = 'oI353UMcx6n0soIuwliQkcN/hiWtBf5IjRc8LH1yMDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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