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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '558a6f477659cbe858b2b7205b407b812510e563e6051b2b4bc28a07085778ee' 
  AND token = 'is2/LQP/5OEvWFde1E4noYtl+KdMycvaM7RWbSmP2pI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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