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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52ee021aeec10ec7e9343017a13f26be9df1546e5147122fb10d459964fab469' 
  AND token = 'o82MBpi5P1nHanNaHNXwLXQ3pg6J/uFBcXdOyUamkuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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