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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa347a6239b7dbf819fdff19e1a85b601643f1ed48c660c1169effe1203c222c' 
  AND token = 'Dh9SQxGpxKf529oFp+kFEI29npnjL9LYRQPNODsoNtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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