SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66edf5186cd33d4821fe9c17066a711fdc225eb68b624647c75d805e0328b3d0' 
  AND token = 'CTXIskZnLWVIvjYExGoNwaOAchClYvW3yUN6XCEhl/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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