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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e5275ffc19a7fe13e0ee385094ea229b14038f22e5694ee172a414b2a1ee09f4' 
  AND token = 'LMqPLuLoqs3YXs0yVt5swsmLzYe24o6O2mBtZl2gYD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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