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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53491472f8e9b449e00bfc3ee4438d47c801d5ab83ab8228f6ead9cbacbcef2c' 
  AND token = 'G0vSOGbhiaFmtj+ISL9cuyLHqbc1Sk8pNte4WSjqFk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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