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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44acc9aff9c4a023c6ffbc17da6635b67198ce28f8ca95d02d5416d74515f251' 
  AND token = 'fL3Ae3LGOnc40WL3D9T5YYKFmpOPO83WZMzNr+ldsFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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