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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bac5b425a36d5c2661bafbd70f1332b4941ea5c543d7f1bae9c57446f3b2c9d9' 
  AND token = '91/Tupzzbd2g/F5M71Gy5qZSOn7ycVcbM5kTodraDYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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