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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e940456d8d07fc780699a4862b1888ca5d6ec1e064387ffb126967837f7e211' 
  AND token = '4Z6zSHBfnQEF6Co3kFYoUfdPA/6f7mfcNVucdOSULZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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