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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35ee70adcbdb80066e3b2d56cd7c276b58ad3ebc8499364ee4c3b708dcb65d7a' 
  AND token = 'tTIiRElwPknV8yxPC40y1QQyoxGPJEKR1W8p1IT+xHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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