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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '59a91d571b77546dc5a4be6d901e06d97a4f60e324fcfd921ec9b9a834b834c2' 
  AND token = '+ooB5yh0h81BwtuX0KNAAWbtDelXIldNpYUGiWWG/gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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