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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f56c1dd369bd2f81938d8bd7e2e06b1659937dcad6519a344a3d2fa1a54fefe8' 
  AND token = '/bI48N+iTRjO/24c7nxJRWNeKU0rHPrFdMvRXebyoj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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