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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69b3f80f06d689a8fa0c4c6e08b335d63530d8b8861882a0b71e67e540ad957c' 
  AND token = 'qxpQBLtrOxOgjBaWqF5OIMMmfjT30TnMvV0APpjHlvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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