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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a07d64d9469a5e41a173a2d7603c72d0564daeae5b6dc1baf3e3c1d7c4dc5cdd' 
  AND token = '7UwraCoN2L39CMd9K+pJHCOBH6oKjB30qXf01OfmjBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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